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This ongoing evolutionary tug-of-war between plants and herbivores defines much of the natural world.<\/p>\n
Utah State University<\/a> ecologist Sara Weinstein believes these choices reveal much about survival. \u201cUnderstanding how these animals navigate these choices is fundamental to understanding what these creatures need to survive and how species<\/a> respond to changing conditions.\u201d<\/p>\n Woodrats and toxic plants<\/p>\n Among the many plant eaters, woodrats offer a surprising case study. Native to North America, these rodents consume a wide range of plants.<\/p>\n \u201cWoodrats are remarkable in their ability to eat truly awful, toxic plants,\u201d said Weinstein. \u201cIf there are no other options, woodrats can consume plants like creosote bush, mesquite and juniper, which are full of disagreeable compounds like alkaloids and terpenes.\u201d<\/p>\n Weinstein and colleagues from several universities recently published findings from an eight-year survey of woodrat populations across North America.<\/p>\n \u201cWoodrats are a phenomenal model organism for understanding how wild animals<\/a> make choices about what to eat,\u201d Weinstein explains. Their habitats provide varied food choices, allowing researchers to study how animals decide among safer or riskier plants.<\/p>\n Analyzing the diets of woodrats <\/p>\n Unlike city-dwelling rats, woodrats avoid people. \u201cWoodrats are very distant cousins of the better known, and omnivorous, New York pizza rat,\u201d Weinstein noted. \u201cYou are unlikely to see woodrats, unless you\u2019re in relatively undeveloped habitat.\u201d<\/p>\n Despite their shy nature, woodrats are widespread across the United States. Their abundance makes them excellent research subjects, especially since multiple species<\/a> often share the same environment.<\/p>\n \u201cCompared to large herbivores like deer, moose or elephants, woodrats are much easier to capture and handle,\u201d said Weinstein. \u201cThey also readily provide us with material for diet analyses, because they tend to defecate in traps.\u201d<\/p>\n These droppings become data-rich samples. Weinstein noted that each sample combines about a day of food choices. This allows scientists to capture a snapshot of their diets.<\/p>\n Patterns in herbivore diets<\/p>\n Advancements in DNA metabarcoding, using next-generation sequencing, have transformed diet research. <\/p>\n \u201cIt\u2019s a very powerful and accessible technique to characterize the unseen,\u201d Weinstein said. This method has helped reveal important patterns in how herbivores eat.<\/p>\n Despite progress, dietary niche breadth remains poorly understood. The research shows that both specialization and generalization carry costs for herbivores.<\/p>\n \u201cA longstanding notion is that if you\u2019re highly specific in what you eat \u2013 you only eat one thing \u2013 then, if you lose access to that plant \u2013 say, it disappears because the ecosystem changes or an invasive species pushes it out \u2013 you\u2019re going to be in trouble,\u201d said Weinstein.<\/p>\n Generalists adapt more easily, shifting diets when needed. Yet the story is more complex. Most woodrat populations are generalists, but at the individual level, these generalists\u2019 diets may not be as broad as we previously assumed, explained Weinstein.<\/p>\n \u201cWe tend to think of generalists as being a jack-of-all-trades, master of none. However, it looks like most generalists are more aptly described as jacks-of-all trades, master of some.\u201d<\/p>\n Implications for ecosystems<\/p>\n Individuals often select consistent subsets of plants, helping them manage risks from toxins. These findings matter beyond woodrats.<\/p>\n \u201cUltimately, these constraints on animal diets have important implications for our understanding of food webs, species interactions and which populations are more likely to persist in changing ecosystems,\u201d said Weinstein.<\/p>\n The study highlights how much we still have to learn about herbivores. By tracing dietary strategies across individuals, populations, and species<\/a>, scientists gain insight into resilience and vulnerability in a changing climate. <\/p>\n In the end, the secret lives of woodrats remind us that even the smallest animals can unlock big lessons about survival.<\/p>\n The study is published in the journal Proceedings of the National Academy of Sciences<\/a>.<\/p>\n Image Credit: Sara Weinstein<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.\u00a0<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Plants protect themselves. They often produce chemicals that discourage animals from feeding on them. For herbivores, survival means…\n","protected":false},"author":2,"featured_media":148737,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[64,63,128,338],"class_list":{"0":"post-148736","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-wildlife","8":"tag-au","9":"tag-australia","10":"tag-science","11":"tag-wildlife"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/148736","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=148736"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/148736\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/148737"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=148736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=148736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=148736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}